The standard OS for a PC is Windows, and the latest version is Windows 7.
Win 7
Usually referring to the latest version of Microsoft Windows, sometimes to the latest version of OS X.
If by Microsoft you mean the Windows operating system: The latest general OS is Vista (6.0.6002) The latest server OS is Windows Server 2008 (6.0.6002) The latest (release candidate) for Vista's successor is Windows 7 (6.1.7100)
The latest trend in operating system is the ability to connect with most devices. These is what is known as compatibility of the operating system.
The latest version of Mac OS X is Mac OS 10.8 "Mountain Lion." It was released on July 25, 2012. Updates through April 22, 2013 have produced version 10.8.3 The latest Windows version is Windows 8, released on August 1, 2012
version 7
Windows 7
The latest version of Windows Movie Maker is v2.6 (for Vista).
The "latest" OS released by Microsoft is Windows Server 2008. The latest USER operating system is Vista.
My Windows 7 laptop has Version 5.5.0.124 - if that's any use !
Windows 7.